Ground Water Balance at Barton Springs

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Ground Water Balance at Barton Springs

• Seyoum Asamenaw
• Surface Water Hydrology,
• 03/23/2005

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Out line

• Study Objectives
• The Study area (Geology, Hydrogeology)
• Ground Water Recharge
• Cell Water Budget
• What is left

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Study objectives

• Estimating the Ground Water Recharge
• Calibrating the Modflow model and doing water
  budget study for the model boundary
• Interpreting the predictive simulations through
  2050

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The Edwards Aquifer
http//www.edwardsaquifer.org/Pages/frames_aquifer
.html
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Barton Springs

• Part of the Edwards Aquifer
• Includes Travis and Hay counties
• 80 unconfined
• 20 confined
• 85 of recharge comes from Streams
• 15 diffused inter stream recharge

http//www.edwardsaquifer.net/
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Geology

• Lower Cretaceous Carbonate
• Marine Transgressive-Regressive sediments
• Conglomerate, Shale, Marl, Sand Stone, Austin
  Chalk and Del Rio Clay

http//www.geo.ucalgary.ca/macrae/timescale/time_
scale.gif
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Hydrogeology
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Cell Water Budget
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Change in storage
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Estimating Recharge
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Estimating Recharge
Year 2002 Gage at loop 360 (cfs) Lost Creek (cfs) Barton Springs (cfs) Est. R (cfs) Est. R (feet/day/cell)
January 55.2 72.3 112 35 0.1223
February 17.3 34.6 109 30 0.1033
March 3.34 19.2 102 19 0.0664
April 1.39 14.9 98 15 0.0515
May 0.017 3.39 90.5 3 0.0117
June 16.9 20.6 79.7 20.6 0.0712
July 494 592 96.7 138 0.4769
August 9.3 33.8 101 30 0.1029
September 0.032 9.94 92 10 0.0344
October 34.1 48.3 85.8 32 0.1101
November 78.2 98.7 98.2 39 0.1361
December 115 130 106 44 0.1532
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On going and future works

• Calibrating the predictive simulation through
  2050
• Writing the report

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Thanks

• Dr. Maidment
• Gil Strassberg